Thermostat



FIG. 1 is a perspective view of a thermostat showing my new design.

FIG. 2 is a front view thereof.

FIG. 3 is a rear view thereof.

FIG. 4 is a top view thereof.

FIG. 5 is a bottom view thereof.

FIG. 6 is a right side view thereof; and,

FIG. 7 is a left side view thereof.

The broken lines in the views shows environmental features which are for illustrative purposes only and form no part of the claimed design. 

The ornamental design for a thermostat, as shown and described. 